As Southern California continues to embrace ‘dockless’ bike sharing, a new player in the app-based mobility market has picked up considerable momentum — electric scooters.

These motorized scooters have created a challenge for local authorities as riders of all ages from beach communities to urban centers have in recent weeks and months been riding illegally on sidewalks and without helmets.

Like dockless rental bikes, users can unlock the scooters using a smart phone and then drop them anywhere. The business comes in contrast to the docked model, where users must pick up and return bikes to a fixed station.